Tool for fluid actuated machines



Oct. 18, 19332.- RENFER 1,882,906

TOOL FOR FLUID ACTUATED MACHINES Filed Nov. 7. 1929 INVENTOIR Patented Oct. 18, 1932 UNITED STATES PATENT OFFICE JOHN 3. mm 0! CLEVELAND, OHIO,'ABSIGNOB TO THE CLEVELAND ROCK DRILL COMPANY, 01 CLEVELAND, OHIO, A CORPORATION 013' OHIO TOOL FOR FLUID ACTUATED MACHINES Application filed November 7, 1929. Serial in. 405,515.

The present invention relates to tools for fluid actuated machines of the hammer type.

One object of this invention is to secure a tool for producing the bitumen core required as a sample in testingasphalt pavement or othermaterials.

Another object of this invention is to proa fluid actuated machine with a tool for removing the bitumen surface covering of a road, preparatory to drilling holes for determining the underground conditions.

Another object of this invention is to produce an as halt core cutter having means for ejecting said core after the cutting operation.

Another object of this invention is to secure a tool which can easily be attached to and removed from a fluid actuated machine.

Other objects and advantages more or less ancillary to the foregoing and the manner in which i. e various objects are realized reside in the specific construction and aggroupment oi the elements peculiar to this structure, as will become apparent from a more complete examination of this specification.

In the drawing:

Fig. 1 is an elevational View illustrating a preferred embodiment of the cutting tool connected to a rock drill and positioned upon the work;

Fig. 2 is an elevational view illustrating the cutting tool and a portion of its shank;

Fig. 3 is a longitudinal sectional View of the cutting tool taken on a plane indicated by the A line on Fig. 2;

Fig. 4; is a transverse sectional view taken on a plane indicated by the line 4-4 on Fig. 8.

Referring to the drawing, 10 is a fluid aotuated machine of the reciprocating hammer type. Secured to the machine in the usual manner, there is a shank 11 formed with a retammg collar 12 and an arm extension 13 terminating in a tapered shank 14. The tool proper is formed of a conical member 15 provided at one end with a tapered socket 16 adapted to fit snugly over the tapered shank 14. The member 15 is provided with a bore 17 of adequate size to furnish the core or disc desired. The bore is tapered toward its out-er end, the purpose of which will be explained later. The outer end of member 15 is pro- 0 vided with a cutting edge 18, formed of any suitable metal which will satisfactorily resist wear and therefore reduce the cost of operation. One side of the member 15 is provided with an elongated opening 19, the width of which is slightly greater than the diameter of the bore 17. Opposite said opening the member 15 is a ertured as at 20, the purpose of which will be explained hereinafter.

In the operation of the device, the shank of the tool is inserted into the machine in the usual manner. The blows from the reciproeating hammer are transmitted to the member 15 through the arm 13, and thus to the cutting edge 18, causing the tool to penetrate into thebitumen composition. Due to the malleability of the composition, the tool will enter without much dificulty a distance equal to the thickness of the asphalt. At this point the operator will notice a greater resistance to the penetration and will stop the machine to remove the tool from. the work. Due to the tapered outside walls, the tool will easily be pulled out of the asphalt and due to the taper of the bore 17, the plug or core of asphalt will remain within the tool.

The core can then be ejected by pushing it toward the inner end of the conical bore 1'7,

and then pushing it through the elongated openin 19 by means of any suitable instrument inserted through the aperture 20. After the necessary tests or drilling have been erformed, the hole can be refilled with any esirable composition and the core can be returned to its original place without injuring the pavement in any way.

Although the foregoing description is necessarily of a detailed character in order to completely set forth the invention, it is to he understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various re-arrangements of parts and modifications of structural detail may be resorted to without departing from the scope or spirit rounded by a cutting edge, the interior and exterior walls of sa1d member ta ring inwardly and downwardl to facilitate the withdrawal of said mem r from the material being cut and to retain therein a block out from the material, said member having a discharge opening in the side thereof communicating with the interior of the same, the width of said opening being as great as the inner width of said member, the height of said opening being greater than the distance from said cutting edge to the lower edge of said opening, there being an aperture in said member oppositely disposed to said opening and adapted to receive therein an e ecting mandrel, and means for attaching sai memher to an operating shank of a fluid actuating machine.

In testimony whereof I hereunto afiix my signature this 4th day ofNovember, 1929.

JOHN E. RENFER. 

